355ci Help.
355ci Help. I dont actually have a camaro, its an 90 rx7, with everytihing camaro in it.
355ci out of '88, 6 spd out of '02 and POSI. the motor doens't really have anythign 88 in it, of course except the block. Car is pretty quick.
I have a couple of questions.
first of all what is my motor? 355ci chevy carburetor..would that be lt4??
Also Who would make custom headers for that kind of motor.. I could probably find out better if i knew what motor it is. Thing is..had to get small headers, because steering column in the way of bigger headers, so im trying to find custom headers that would go closer to the motor and into pipe..car is already pretty quick but those headers i got on there not moving air like bigger ones would. Would probably release up to 40 hp just from them..
Q3: Got 2 straight 3inch pipes coming right out of headers, isn't that the most hp..i couldn't imagine muffler giving more hp...(dumb question)
I'm sorry for many questions I'm just trying to start learning this stuff and workign on the car myself.
If this is the wrong section of the forums let me know.
Thanks.
355ci out of '88, 6 spd out of '02 and POSI. the motor doens't really have anythign 88 in it, of course except the block. Car is pretty quick.
I have a couple of questions.
first of all what is my motor? 355ci chevy carburetor..would that be lt4??
Also Who would make custom headers for that kind of motor.. I could probably find out better if i knew what motor it is. Thing is..had to get small headers, because steering column in the way of bigger headers, so im trying to find custom headers that would go closer to the motor and into pipe..car is already pretty quick but those headers i got on there not moving air like bigger ones would. Would probably release up to 40 hp just from them..
Q3: Got 2 straight 3inch pipes coming right out of headers, isn't that the most hp..i couldn't imagine muffler giving more hp...(dumb question)
I'm sorry for many questions I'm just trying to start learning this stuff and workign on the car myself.
If this is the wrong section of the forums let me know.
Thanks.
Let me see if I can help........
You will need the casting number off of the block......check on the top of the block, right behind the cylinder head....you can go to mortec.com for a huge list of casting numbers and they can give you a great source of info on the motor....the later generation lt1/lt4 motors didnt come out until 93 I believe. I could be wrong on this but I would check.
As far as headers, see if there is a conversion kit out there...if not, you may have to have a set made...Do a google search and see what you come up with.
As far as the stright pipes, you may gain some HP but lose some torque down low.....no big deal since its a light car. Today's muffler technology is great and will keep Johnny Law from giving you a ticket.
Good luck and keep us updated.
Mike
You will need the casting number off of the block......check on the top of the block, right behind the cylinder head....you can go to mortec.com for a huge list of casting numbers and they can give you a great source of info on the motor....the later generation lt1/lt4 motors didnt come out until 93 I believe. I could be wrong on this but I would check.
As far as headers, see if there is a conversion kit out there...if not, you may have to have a set made...Do a google search and see what you come up with.
As far as the stright pipes, you may gain some HP but lose some torque down low.....no big deal since its a light car. Today's muffler technology is great and will keep Johnny Law from giving you a ticket.
Good luck and keep us updated.
Mike
Last edited by mikes98z; Mar 22, 2005 at 02:18 PM.
Originally Posted by mikes98z
you may gain some HP but lose some torque down low
I appreciate the info. Also am getting help on the headers from the guy i bought the car from, he seems to know his stuff. He said he knows a guy that makes headers JUST for that car, so he must make 1. (jk)
actually there is about 3000 rx7s of all gens world wide with v8s in them.
Teching In
Joined: Feb 2005
Posts: 46
Likes: 0
From: Wisconsin
I agree with mike, you need to find the casting numbers. The only 350 from an '88 Camaro would be the L98 TPI. Obviously it was modified, being bored out .030 over (to get you the 355ci) and the TPI system was scrapped for a carb setup, but that is only if the motor in the camaro was original to begin with... so check the casting numbers to find out more.
Regarding the size of your exhaust, the bigger you go the worse your torque will be. You need to maintain some backpressure on the exhaust for everything to work most efficiently, and with a 355 I don't think you are gaining enough horsepower to justify the loss of torque. For what its worth, thats my opinion.
Regarding the size of your exhaust, the bigger you go the worse your torque will be. You need to maintain some backpressure on the exhaust for everything to work most efficiently, and with a 355 I don't think you are gaining enough horsepower to justify the loss of torque. For what its worth, thats my opinion.
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You're right its not no original 355. If its bored over does that mean its not as stable when it comes to HUGE amounts of power? I'm sorry im so new. I wonder how much power it would hold. Ill get info on the compression rat., pistons, heads
Last edited by kukri; Mar 23, 2005 at 03:14 PM.
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Verdad Gallardo Teching In
Joined: Feb 2005
Posts: 46
Likes: 0
From: Wisconsin
Not at all, a .030 overbore is well within the allowable range for a stock 350 block. You can actually go bigger if you want, or even leave the bore as is, and stroke it out to 383! Then you can really start pulling some power out of that block. When you find out more info you can better predict the power of the motor, but without a dyno it would all be a "best guess". You can assume conservatively that a more or less stock "355" is somewhere in the mid to upper 200's... but again it is just a guess without knowing what was really done to the motor and a dyno for real data analysis.
Does anyone know what could it be. My car yesterday started being REDICULOUSLY LOUD. It's aleady loud as hell, but i went to a gas station filled up with gas and next time i cranked it it was LOOOOOUD. During cruising its the same, but during revving and acceleration it gets rediculous. I'm getting decent oil pressure and enough oil in there, so its not like oil pump is broke. It's a little dry sound, but not really like it has no oil sound.. Any idea what it could be?
I hope that's what that is nothing more. i see some exausts comeing out of under there car... It's actually loud from the motor not the exhaust pipes, someone said i might have manifold/header leak and they're old and rusty with rusted bolts.. Wow it would be a pain to replace those 
Would man. leak affect power? i would think it would due to loss in compression..
Life hates me. j/k
Would man. leak affect power? i would think it would due to loss in compression..
Life hates me. j/k
Last edited by kukri; Mar 24, 2005 at 04:52 PM.
L98 is a good motor to start with. It came from the factory with 9.3:1 CR, 230 hp/330ft.lbs withthe TPI in the camaro, but since yours has been rebuilt, I am not sure. I would guess you have an exhaust gasket leak at the head. Place some WD on the bolts when the headers are cool... Just be careful not to break a bolt.
Good luck
Good luck
I replced the gaskets between heders/block, and then saw that its the gasket that connects headers to exhaust pipe.... its was missing 2 bolts..other one has one lose..for some reason bolts geting lose, i guess because of vibration, I'm gonna put some thread lockers. pain in the butt to get there, i have to lift the car somewhere.. motor is at 10.25:1 cr, also
flat top keith black pistons
Scat 6" rods
Scat crank
Trick Flow 23 degree heads
Comp Cams XE284 cam and lifters
Summit 'Black' aluminum roller rockers
Miloden Diamond Stripper windage tray
It's got turbo rx7 rear end posi and 4:10 gears
flat top keith black pistons
Scat 6" rods
Scat crank
Trick Flow 23 degree heads
Comp Cams XE284 cam and lifters
Summit 'Black' aluminum roller rockers
Miloden Diamond Stripper windage tray
It's got turbo rx7 rear end posi and 4:10 gears
Deranged Rat Fink
iTrader: (3)
Joined: Jun 2004
Posts: 4,495
Likes: 1
From: Right here at my laptop, DUH!
The questions you are asking would be better suited for the "Conversions & Hybrids" forum. Also , without a casting # from the block ,it's going to be difficult to tell exactly what you do have. There are a few RX7/SBC swaps in the forum I just mentioned. I would have told this earlier but I've only been a moderator since ....um...... LAST NIGHT! 
The L98 block wasn't really that different from the older smallblocks. The only real big thing that made in an L98 is the injection system, which you no longer have. That injection system was the reason for the low redline. It just stopped making power after about 5200rpm. Now that you've got the carb, the sky's the limit.